require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
require File.expand_path('../shared/push', __FILE__)

describe "Array#<<" do
  it "pushes the object onto the end of the array" do
    ([ 1, 2 ] << "c" << "d" << [ 3, 4 ]).should == [1, 2, "c", "d", [3, 4]]
  end

  it "returns self to allow chaining" do
    a = []
    b = a
    (a << 1).should equal(b)
    (a << 2 << 3).should equal(b)
  end

  it "correctly resizes the Array" do
    a = []
    a.size.should == 0
    a << :foo
    a.size.should == 1
    a << :bar << :baz
    a.size.should == 3

    a = [1, 2, 3]
    a.shift
    a.shift
    a.shift
    a << :foo
    a.should == [:foo]
  end

  it "raises a RuntimeError on a frozen array" do
    lambda { ArraySpecs.frozen_array << 5 }.should raise_error(RuntimeError)
  end
end

ruby_version_is "2.5" do
  describe "Array#append" do
    it_behaves_like(:array_push, :append)
  end
end